JPH051211Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a tilling claw support structure that allows the tilling claw of a tiller to be easily and quickly attached and detached.

(b) Technical background and problems The tilling claw of a tiller is attached by inserting the holder part of one end of the tilling claw into each of a number of cylinders protruding from the outer peripheral surface of the tilling claw rotating shaft. If necessary, all of the attached tilling claws are removed and a tilling claw having a blade portion of a different shape is attached to replace the tilling claws.

By the way, as shown in FIGS. 6 and 7, the conventional tilling claw support groove structure has a cylindrical body 3 protruding from the outer peripheral surface 2 of a tilling claw rotating shaft (hereinafter simply referred to as the rotating shaft) 1. The cross-sectional shape of the hollow portion 4 of the cylinder 3 serving as a claw holder, perpendicular to the axis XX of the cylinder 3, is a diamond shape or a shape of two wedge shapes facing each other. A held part 6 having a rhombic cross-sectional shape similar to the cross-sectional shape of the hollow part is inserted into this hollow part 4 at one end of the tilling claw 5, and this held part 6 is connected to the rotating shaft. It is attached to the cylindrical body 3 by a pin 7 which is provided in parallel and passes through the cylindrical body 3 and the inserted holder portion 6. The held portion 6 and therefore the tilling claws 5 are rotatable around the pin 7.

When the rotating shaft 1 rotates in the direction of the arrow m shown in FIG. 8, the tilling claws 5 are also rotated in the same direction. and the inside of the other end of the tilling claw 5 (not shown)
When the tiller collides with the land, the tilling claws 5 rotate in the direction of the arrow n around the pin 7, and the tilling claws 5 rotate in the direction of the arrow n, and the hollow part 4
The held part 6 rotates in the direction opposite to the rotational direction of the rotating shaft 1, and the upper end (in the drawing of FIG. 8) of the held part 6 moves upward to fill the hollow part 4. Approaching the upper end part 9, the lower end 1 on the blade side of the held part
0 approaches the lower end portion 11 of the hollow portion 4, and the wedge-shaped portion of the held portion 6 is pushed into the wedge-shaped portion of the hollow portion 4 at each location.

In this state, the side surface of the hollow part 4 and the side surface of the held part 6 are in contact with each other, as shown in FIGS. 10 and 11, which are enlarged views of the left side of the pin 7 in FIG. The upper end 8-1 of the edge 12 of
8-2, that is, this upper part 8 in FIG.
The corner A of -1 has transitioned to B, and the corner C on the center side of the wedge forming portion has transitioned to C-1. Therefore, the square ADFE in Figure 10 is a rectangle in Figure 11.
The portion shown by BDCA and located outside the plane G of the wedge-shaped portion of the hollow portion 4, that is, the quadrangle
Approximately half of the ADFE is in surface contact with the wedge-shaped molded part of the hollow part.

Initially, the edge 12 of the held portion 6 of the tilling tines is in line contact with the hollow portion due to the elastic deformation of the cylindrical body, but as the contact point wears, the contact becomes surface contact and the contact surface gradually increases to the state shown in FIG. 11.

The above condition also occurs on the lower right side of pin 7 in FIG. As the contact area increases, in order to pull out the held part that has been pushed into the wedge-shaped part of the hollow part from the wedge-shaped part, the tiller must be struck gradually in the direction of arrow z in Figure 8. When this occurs, the held portion that has come out of the wedge-shaped portion passes through the neutral position shown in FIG. 6 and enters the state shown in FIG. 9, where it is again held between the hollow portions. Therefore, the tilling claw is rotated back and forth several times and when it reaches the neutral position, the tilling claw is removed from the cylindrical body.

As described above, the conventional tilling claw support structure has the problem that it is not easy to remove the tilling claws and it takes too much time.

(c) Purpose of the invention The purpose of this invention is to advantageously solve the above-mentioned problems and provide a tilling claw support structure that allows the tilling claws to be removed easily and in a short time.

(d) Structure of the invention In order to achieve the above object, this invention removably pivots the held part of the tilling claw to a cylindrical claw holder protruding from the tilling shaft, and the claw holder and the held part A clamping pressure support part is provided between the two to increase the clamping force by relative rotation of the two during tilling, and locally clamp the held part to the claw holder, and when a force exceeding the clamping force is applied, the clamping force is increased between the two. A contact portion for stopping relative rotation is provided, and the tilling claw is provided with a clamping pressure relief portion that prevents the two from being clamped by relative rotation in a direction opposite to the relative rotation of the holder with respect to the claw holder during tilling. It was established.

(e) Examples Examples of this invention will be described below in detail based on the drawings.

Figure 1 is a side view showing the holder part attached to a cylinder as a claw holder having the structure of the improved proposal that was the premise of this invention, and Figures 2 and 3 are the same as in Figure 1. , - is a sectional view.

Here, before explaining one embodiment of this invention,
To explain the above-mentioned improvement plan, 1, 2, and 7 indicate the rotary shaft of the tilling claw, the outer circumferential surface, and the pin, as in FIG. 6. Reference numeral 23 used is a cylindrical body serving as a claw holder, in which opposing U-shaped parts 23a and 23b are joined by welding 27. 24 is a hollow part of the cylinder 23; 25
is a tilling claw, and 26 is a held portion on one end side of the tilling claw 25. In this embodiment, the hollow portion 24 is formed in a direction opposite to the rotational direction (arrow m direction) of the rotating shaft 1 (arrow n direction).
A wedge is formed in the cross-sectional shape perpendicular to the axis XX of the cylinder body 23 at the location (see FIG. 8) where the tilling claw 25 comes into contact with the held portion 26 when it rotates around the pin 7 in the As shape forming portions, surfaces 28a and 28b with an included angle of approximately 45° are provided on the lower side of the opening of the cylinder 3 than the pin 7, and surfaces 29a and 29b are provided on the upper side of the rotation shaft 1 side of the pin 7, respectively. On the other hand, the cross-sectional shape of the held part 26 is made rectangular as shown in FIG. Substantially point contact points 30a, 3
The contact portion is arcuate so that only 0b, 31a, and 31b are in contact, and the clamping pressure support portion is configured.

Note that the portions having these arcuate portions on both sides are the held portions 32 and 33, respectively.

The cross-sectional shape of the hollow portion, other than the wedge-shaped portion, has parallel surfaces 36 and 37 as clamping pressure relief portions that are very close to both side surfaces 34 and 35 of the holder portion 26, respectively, and the rectangular length of the holder portion 26. The shape is formed by flat end surfaces 40 and 41 that are parallel to and close to the upper end surface 38 and lower end surface 39 of the direction, respectively. In this embodiment, the end surface 39 of the hollow portion on the right side of the pin 7 in FIG. 1 as shown in FIG. 2 is the stopping point, and the end surface 40 of the hollow portion on the left side of the pin 7 as shown in FIG. When the tilling claws are strongly rotated in the direction of the arrow n, the upper end surface 38 of the held part becomes a contact point and comes into contact with the end face 40 of the hollow part, or the lower end face 39 of the held part The gap dimensions between the surfaces 38 and 40 and between the surfaces 39 and 41 were set so that the surfaces 38 and 40 and the surfaces 39 and 41 abutted against the end surface 41 of the hollow portion and the clamping pressure of the clamped portions 32 and 33 did not exceed a predetermined level.
Furthermore, when the tilling claw rotates about the pin 7 in the same direction as the rotational direction of the rotation shaft, the hollow part of the cylinder becomes hollow on the right side of the pin 7, as can be seen from FIG. The upper end surface 38 of the held part is in contact with the flat end surface 40 of the pin 7, or, as can be seen from FIG.
The lower end surface 39 of the held part is only in contact with the held part, and the held part is not clamped.

In this improved tilling claw support structure, the tilling claws rotate together with the rotation of the rotating shaft, and the holding parts 32 and 33 of the held part are held by the wedge-shaped part of the hollow part when the tilling claws rotate and till the land. There was no rattling, and since the state during this clamping was essentially a point contact, the tiller claws could be removed more easily and in a shorter time than in the case of surface contact.

Next, Figures 4 and 5 show an embodiment of this invention,
FIG. 4 is a sectional view taken at the same point as - in FIG. 1, and FIG. 5 is a side view of only the holder portion in FIG. 4.

The main difference between the structure of this embodiment and the improvement plan described above is that in the above embodiment, the cross-sectional shape of the hollow portion was changed on the right and left sides of the pin 7 without changing the cross-sectional shape of the held portion. However, in this embodiment, the cross-sectional shape of the held portion of the tilling claw 55 is changed between the right side and the left side of the pin 7 without changing the cross-sectional shape of the hollow portion.

That is, the hollow part 5 of the cylinder 50 as a claw holder
The cross-sectional shape of 4 is such that the mouth edges of two tips are in contact with each other anywhere in the axial direction, while the holder portion 56 is on the side facing the end edge from the pin hole 7a (the left side in FIG. 5). ), the surfaces 57a, 57 of the wedge-shaped portion above the hollow portion are provided in the upper portion.
The projections 59a and 59b have arcuate parts 58a and 58b that make point contact with the pin hole 7a, and on the right side of the pin hole 7a, the surfaces 60a and 60 of the wedge-shaped forming part on the lower side of the hollow part
constituting a clamping pressure support portion having protrusions 62a and 62b having circular arc portions 61a and 61b in point contact with b;
The portions other than the protrusions 59a, 59b and 62a, 62b are configured as a clamping pressure relief portion A having an appropriate distance from the inner surface of the hollow portion and having a surface parallel to the inner surface, as shown in FIG. .

Incidentally, the included angle β of both surfaces of the wedge-shaped portion in this embodiment is approximately 30°, and the lower end surface 63 and upper end surface 64 of the hollow portion are flat surfaces, and these surfaces 63, 6
4 is the stopping point when rotating in the opposite direction to the rotation axis,
It also serves as a contact point when rotating in the same direction as the rotation axis.

In one embodiment of this invention as well, the tilling claws could be easily and quickly removed from the cylindrical body due to the presence of the clamping pressure relief portion A, as in the above-mentioned improved proposal.

Note that this invention is not limited to the above embodiment. For example, a wedge-shaped section may be provided on the tilling claw 56 side, and a contact section that partially abuts the wedge-shaped section may be formed on the cylinder 50 side to serve as a clamping pressure support section.
In this case, the portion of the tilling claw 56 on the opposite side in the rotational direction to the clamping pressure support section is formed so as not to come into contact with the cylindrical body 50, thereby forming a clamping pressure relief section.

(f) Effects of the invention According to this invention, the tilling claw can be supported with one touch by the clamping pressure support part, and it can be removed with one touch by the clamping pressure relief part provided on the side of the tilling claw.

[Brief explanation of drawings]

Figure 1 is a side view of the improvement plan that was the premise of this invention, and Figures 2 and 3 are - and - of Figure 1, respectively.
4 is a sectional view of an embodiment of the invention, FIG. 5 is a side view of the holder portion shown in FIG. 4, FIG. 6 is a side view of the conventional example, and FIG. 6 is a cross-sectional view taken along line a-a, FIGS. 8 and 9 are explanatory diagrams of the operation of the held part in the hollow part, and FIGS. 10 and 11 are side views of the held part when the held part rotates in the conventional case. FIG. 4 is an explanatory diagram of a contact situation between the hollow portion and the wedge-shaped forming portion of the hollow portion. Explanation of the symbols indicating the main parts of the drawings, 50...Cylinder (claw holder), 55...Plowing claw, 56...Holded part, 57a, 57b, 60a, 60b...
...Both sides of the wedge-shaped forming part, 59a, 59b, 62
a, 62b...protrusion part, A...pinch pressure release part.

Claims (1)

[Scope of utility model registration request] The held part of the tilling claw is removably pivoted to a cylindrical claw holder protruding from the tilling shaft, and the clamping force is increased between the claw holder and the held part by relative rotation of both during tilling, A clamping pressure support part is provided to locally clamp the held part to the claw holder, and a contact part is provided to stop the relative rotation of the two when a force greater than the clamping force is applied, A tilling claw support structure characterized in that a clamping pressure release part is provided which prevents clamping of the two parts by relative rotation in a direction opposite to the relative rotation during tilling with respect to the claw holder.